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ID = 74632
United States of America (USA)
Brand: Harp (tubes), Royal Manufacturing Co.; New York City, NY
Tube type:  Triode, vacuum   Audio Frequency 
Identical to Amplifier_Harp
Similar Tubes
Normally replaceable-slightly different:
  C301A ; UV201A

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Was used by Radio/TV-reception etc.
Filament Vf 5 Volts / If 0.25 Ampere / Direct / Battery =
Description Advertisement in Radio News March 1925 
Information source Radio News   March 1925

uv_triode_tube~~19.png Amplifier_Harp: Fin Stewart
Fin Stewart

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